B2100= ignition run/start input circuit performance u0126= lost communication with steering u0114= lost communication with final drive output module (2times) u110a= lost communication with SCM-CAN-C My repair man cant deciffer weather its modules or a relay and I cant afford to go to a crysler dealer

Have a scan tool ? Factory or some other professional type scan tool . Not a code reader ,code reader will not view BCM - body control module codes or switch input data . Plus you would need to know how it all works . Ignition switch is a low voltage input to the BCM . Depending on switch position , ACC / RUN / START etc... the BCM will set the power mode for the vehicle by energizing relay's an sending serial data messages over the GMLAN high speed serial data network to different control modules - PCM - powertrain control module . The BCM on your vehicle is what GM calls the PMM - power mode master .

The body control system consists of the body control module (BCM), communications, and various input and outputs. Some inputs, outputs and messages require other modules to interact with the BCM. The BCM also has discrete input and output terminals to control the vehicle body functions. The BCM is wired to the GMLAN High speed serial data buss and the GMLAN Low speed serial data buss and acts as a gateway between them. If the BCM does not communicate the vehicle will not start due to the inability of the engine/powertrain control module (ECM/PCM) and vehicle theft deterrent (VTD) control module to communicate without the BCM providing the gateway function.
Power Mode Master
This vehicles BCM functions as the power mode master (PMM). The ignition switch is a low current switch with multiple discrete ignition switch signals to the PMM for determination the power mode that will be sent over the serial data circuits to the other modules that need this information, and so the PMM will activate relays and other direct outputs of the PMM as needed. Refer to Power Mode Description and Operation for a complete description of power mode functions.
Serial Data Gateway
The BCM in this vehicle functions as a gateway or translator. The purpose of the gateway is to translate serial data messages between the GMLAN high speed buss and the GMLAN low speed buss for communication between the various modules. The gateway will interact with each network according to that network's transmission protocol.
One example of this necessary communication is the communication between the engine/powertrain control module (ECM/PCM) which is high speed serial data and vehicle theft deterrent (VTD) control module which is low speed serial data. If these modules can not exchange information, the vehicle will not start.
Communication between the BCM and a scan tool can be on the high speed GMLAN network or low speed GMLAN network. If one network is lost, the BCM can still communicate with the scan tool. A lost communication DTC typically is set in modules other than the module with a communication failure.

Serial Data Power Mode Master
Power to many of this vehicles circuits is controlled by the module that is designated the power mode master (PMM). This vehicles PMM is the body control module (BCM). The ignition switch is a low current switch with multiple discrete ignition switch signals to the PMM for determination of the power mode that will be sent over the serial data circuits to the other modules that need this information. The PMM will also activate relays and other direct outputs of the PMM as needed. The PMM determines which power mode (Off, Accessory, Run, Crank Request) is required, and reports this information to other modules via serial data. Modules which have switched voltage inputs may operate in a default mode if the PMM serial data message does not match what the individual module can see from its own connections.

Circuit Description
When the ignition switch is placed in the Start position, a discrete 12-volt signal is supplied to the body control module (BCM) notifying it that the ignition is in the Start position. The BCM then sends a message to the engine control module (ECM) notifying it that CRANK has been requested. The ECM verifies that the transmission is in Park or Neutral. If it is, the ECM then supplies 12 volts to the control circuit of the crank relay. When this occurs, battery positive voltage is supplied through the switch side of the crank relay to the S terminal of the starter solenoid.

DTC P1682 Ignition 1 Switch Circuit 2
The ignition 1 voltage of the ignition main relay is more than 3 volts different than the ignition 1 voltage of
the powertrain relay for more than 2 seconds.

There are 2 ignition 1 voltage circuits supplied to the engine control module (ECM). The first ignition 1
voltage circuit is provided by the powertrain relay through a fuse. This ignition 1 voltage circuit supplies
power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The
ignition main relay provides the second ignition 1 voltage circuit to the ECM through a fuse. This ignition
1 voltage provides power to other internal ECM circuits, except those associated with TAC operation.
The ECM continuously monitors the voltage level difference between the 2 circuits.

2004 cts ????? Cadillac cts ?
The body control system consists of the following 2 modules:
• The Dash Integration Module (DIM)
• The Rear Integration Module (RIM)
Each of the 2 body control modules integrate a number of functional systems. Each module is connected to the class 2 serial data circuit, many of the control signals are implemented by class 2 messages.
Dash Integration Module (DIM)
The various DIM input and output circuits are described in the corresponding functional areas as indicated on the DIM electrical schematics.
The DIM functions include the following:
• cigar lighter relay control
• class 2 communication requiring DIM interaction
• exterior lighting control
• headlamp washer control
• hood ajar switch input w/export
• horn relay control
• interior lighting control
• load management
• low side temperature for HVAC compressor
• park key lock output
• power moding control over Class 2 serial data circuit
• reverse lockout solenoid control
• steering wheel controls input
• storage of the clock settings and, sending a message out on the class 2 serial data circuit in response to requests from other modules
• storage of vehicle options and configuration
Serial Data Power Mode
On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the DIM. The PMM receives 2 signals from the ignition switch.
To determine the correct power mode the PMM uses the following circuits:

On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the DIM. The PMM receives 2 signals from the ignition switch.
To determine the correct power mode the PMM uses the following circuits:
• Accessory voltage
• Run/Crank voltage
2-Wire Ignition Switch Table Ignition Switch Position
Accessory (Ignition Accessory/Run)
IGN 1 (Ignition Run/Crank)
Power Mode Transmitted
Off
0
0
OFF/Awake or RAP
Start
0
1
Crank
Accessory
1
0
Accessory
Run
1
1
Run
Fail-safe Operation
Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the PMM fail to send a power mode message. The fail-safe plan covers those modules using exclusively serial data control of power mode as well as those modules with discrete ignition signal inputs.
Serial Data Messages
The modules that depend exclusively on serial data messages for power modes stay in the state dictated by the last valid PMM message until they can check for the engine run flag status on the serial data circuits. If the PMM fails, the modules monitor the serial data circuit for the engine run flag serial data. If the engine run flag serial data is True, indicating that the engine is running, the modules fail-safe to RUN. In this state the modules and their subsystems can support all operator requirements. If the engine run flag serial data is False, indicating that the engine is not running, the modules fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.
Discrete Ignition Signals
Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid PMM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, battery positive voltage, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.
Replacing either one of these module requires programming .
Program the module. Refer to Body Control Module (BCM) Programming/RPO Configuration
Are you sure you want to mess with these .

Trouble Code:
System:
Subsystem: U0114 - (ASE)
Network Communication
Fuel and Air Metering
Lost Communication With FourWheel Drive Clutch Control Module
you may have blow fuse or wiring issue, or a bad 4x4 control module

1st thing I would try after confirming the fuse is good, is disconnecting the black/negative side of the battery and see if the ECM computer resets itself and all the other modules... if not you can always try reprogramming your TCM but it would be best to have a professional assess it.

DTC U1000 and U1255
Class 2 Communication Malfunction , Do you know what class 2 serial data communication network is ? What module set this code an what kind of scan tool did you use to read this code .
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the ID number of the module which sent the message for State of Health monitoring, Node Alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an ID number with at least one critical parameter within about 5.5 seconds of beginning serial data communication, DTC U1000 or U1255 is set. When more than one critical parameter does not have an ID number associated with it, the DTC will only be reported once.
The table below list the modules on the Class 2 Serial Data Circuit that will set a U1000 or U1255 and should be actively communicating the previously described messages on the Class 2 Serial Data Circuit.

Control Module

ID Number
Body Control Module (BCM)
064
Electronic Brake Control Module (EBCM)
040
Instrument Panel Cluster (IPC)
096
Radio
128
Powertrain Control Module (PCM)
016
Sensing and Diagnostic Module (SDM)
088
Diagnostic Aids
When a malfunction such as a open fuse to a module occurs while modules are communicating, a Loss of Communication DTC is set as current. When the modules stop communicating, ignition is turned off, the current Loss Communication DTC is cleared but the history DTC remains. When the modules begin to communicate again, the ignition is turned on, the module with the open fuse will not be learned by the other modules so U1000 or U1255 is set current by the other modules. If the malfunction occurs when the modules are not communicating, only U1000 or U1255 is set.
Test Description
The numbers below refer to the step numbers on the diagnostic table.

1. A DTC U1001 - U1254 Lost Communications with with a history status may indicate the cause of U1000 or U1255.


2. The modules not communicating are the likely cause of U1000 or U1255. The modules that are available on the class 2 serial data circuit are listed in the Circuit Description.


3. The module which was not communicating due to a poor connection to the class 2 serial data circuit may have set DTC U1001 - U1254 Lost Communications with for those modules that it was monitoring.


4. The modules which can communicate indicate the module which cannot communicate. You must clear the serial data communication DTCs from these modules to avoid future misdiagnosis.


5. If all modules are communicating, the module which set U1000 or U1255 may have done so due to some other condition.


6. The module which set U1000 or U1255 is the likely cause of the malfunction.

1

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Record the DTCs set in each module. If using a Tech 2, use the Class 2 DTC Check feature to determine which modules have DTCs set.

Did you record any DTCs in the range of U1001-U1254 with a history status?
Go to Diagnostic Trouble Code (DTC) List
Go to Step 2

2

1. Turn ON the ignition, with the engine OFF.
2. Attempt to communicate with each module on the class 2 serial data circuit. If using a Tech 2, obtain this information using the class 2 Message Monitor feature.
3. Record all of the modules communicating on the class 2 serial data circuit.
4. Compare the list of modules which are communicating to the list given in Circuit Description.

Does any module on the class 2 serial data circuit not communicate?
YES - Go to Step 3
NO - Go to Step 12
Test the following circuits of the module that is not communicating for an open or short to ground:
?€¢
The battery positive voltage supply circuits

?€¢
The switched battery positive supply circuits

?€¢
The battery positive voltage output circuits

?€¢
The ignition voltage input circuits

?€¢
The ignition voltage output circuits

Refer to the following:
?€¢
Control Module References in Body Control System for the applicable schematic

?€¢
Circuit Testing in Wiring Systems

?€¢
Wiring Repairs in Wiring Systems

Did you find and correct the condition?

5

Important: Inspect all connectors in the serial data communications circuit.
Refer to the following:
?€¢
Data Link Connector Schematics

?€¢
Testing for Intermittent Conditions and Poor Connections in Wiring Systems

?€¢
Connector Repairs in Wiring Systems

1. Turn OFF the ignition.
2. Test the class 2 serial data circuits of the module that is not communicating for an open. Refer to the following:

?€¢
Data Link Connector Schematics

?€¢
Circuit Testing in Wiring Systems

?€¢
Wiring Repairs in Wiring Systems

Did you find and correct the condition?
Go to Step 8
Go to Step 6

6
Inspect the harness connector of the module that is not communicating for poor connections and terminal tension at the following circuits:
?€¢
The battery positive voltage input circuits

?€¢
The switched battery positive voltage supply

?€¢
The battery positive voltage output circuits

?€¢
The ignition voltage input circuits

?€¢
The ignition voltage output circuits

?€¢
The ground circuits

?€¢
The class 2 serial data circuits

Refer to the following:
?€¢
Control Module References in Body Control System for the applicable schematic

?€¢
Testing for Intermittent Conditions and Poor Connections in Wiring Systems

?€¢
Connector Repairs in Wiring Systems

Did you find and correct the condition?
Go to Step 8
Go to Step 7

7

Important: Perform the module programming or setup procedure if required.
Replace the module that is not communicating. Refer to Control Module References in Body Control System for the appropriate Repair Instructions for the module replacement.
Did you complete the replacement?
Go to Step 10
--

8

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Select the Display DTCs function for the module which was not communicating.

Does the scan tool display any DTCs which do not begin with a "U"?
Go to Control Module References in Body Control System for applicable Diagnostic System Check
Go to Step 9

9
Use the scan tool in order to clear the DTCs.
Did you complete the action?
Go to Step 10
--

10

Select the Display DTCs function for the modules which had U1000 or U1255 set as a current DTC.
Does the scan tool display DTCs which do not begin with a "U"?
Go to Control Module References in Body Control System for applicable Diagnostic System Check
Go to Step 11

11

Use the scan tool in order to clear the DTCs.
Did you complete the action?
System OK
--

12
Did you record any other DTCs for the modules which had U1000 or U1255 set as a current DTC?
Go to Control Module References in Body Control System for applicable Diagnostic System Check
Go to Step 13

13

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Use the scan tool in order to clear the DTCs.
4. Turn OFF the ignition for at least 5 seconds.
5. Turn ON the ignition with the engine OFF.
6. Select the Display DTCs function.

Does the scan tool display U1000 or U1255 set as a current DTC?
Go to Step 14
Go to Diagnostic Aids

14
Important: Perform the module programming or setup procedure if required.
Replace the module which had U1000 or U1255 set as a current DTC. Refer to Control Module References in Body Control System for the appropriate Repair Instructions for the module replacement.
Did you complete the replacement?
System OK

Definition of Diagnostic Trouble Code P0700 Category: Powertrain Definition: Transmission Control System (MIL Request)Note: This definition of P0700 is applied to all manufacturers

Definition of Diagnostic Trouble Code U0126 Category: Network Definition: Lost Communication With Steering Angle Sensor ModuleNote: This definition of U0126 is applied to all manufacturers

c1223 Malfunction in ABS control system
c1201 Brake Boost Sensor Circuit Range/Performance
c1224 Open or short circuit in NE signal circuit
u0123 Lost Communication With Yaw Rate Sensor Module
u0124 Lost Communication With Lateral Acceleration Sensor Module
u0126 Lost Communication With Steering Angle Sensor Module
p0430 Catalyst System Efficiency Below Threshold Bank 2
p0420 Catalyst System Efficiency Below Threshold Bank 1

you have major problems is it worth fixing???,its gonna be quite a bit

on the dash cluster display, sure.
these are not good codes to get..
what is best is the use a real OBD2 scan tool , and for sure
one the reads extended chrysler codes.
first U110a
U110A is a steering column control module lost communication
if you want to read the FSM on these codes, you can
and do all the tests it states there, to find true cause.
do you, , if not get the car scanned by a mechanic and diagnosed.
B1A28-ECM Mismatch With Skim 126. lost comms with steering angle sensor
141 lost comms with TIPM
151 lost comes with occupant restraint system.

the B1a28 is very serious. or just a loose connector.
the ECM and SKIM say the VIN number is lost. or was garbled
in the comm.s (noise)

Sounds like one of the modules that makes up the BCM - body control module network is having a problem .Do you know anything about automotive electronics ? Serial communication networks ? Electrical systems ?
Table 1: 2-Wire Ignition Switch Table
The body control system consists of the following 2 modules:
• The Dash Integration Module (DIM)
• The Rear Integration Module (RIM)
Each of the 2 body control modules integrate a number of functional systems. Each module is connected to the class 2 serial data circuit, many of the control signals are implemented by class 2 messages.

The various DIM input and output circuits are described in the corresponding functional areas as indicated on the DIM electrical schematics.
The DIM functions include the following:
• cigar lighter relay control
• class 2 communication requiring DIM interaction
• exterior lighting control
• headlamp washer control
• hood ajar switch input w/export
• horn relay control
• interior lighting control
• load management
• low side temperature for HVAC compressor
• park key lock output
• power moding control over Class 2 serial data circuit
• reverse lockout solenoid control
• steering wheel controls input
• storage of the clock settings and, sending a message out on the class 2 serial data circuit in response to requests from other modules
• storage of vehicle options and configuration

When your driving your vehicle an the thing's you have listed above as stopping or going out but the engine keeps running . This is why
Discrete Ignition Signals
Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid PMM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, battery positive voltage, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.

The first step in diagnosing a problem like this would be to have the factory or professional scanner hooked up an check for DTC'S - diagnostic trouble code's .If no code's are found then looking wiring diagrams for the affected system's to see what they have in common , power feed , ground circuit etc.... Then the fun start's . May involve taking parts of the instrument panel apart to check wiring harnesses , connectors , ground connection's etc...
But without testing we'd be guessing . Gauge's that stop working , warning light's on the instrument cluster coming on sounds like a data network problem . The gauges get their info over the data network from the PCM - engine computer . The VSS - vehicle speed sensor , fuel level sending unit , oil pressure etc... are all inputs to the engine computer . They have no direct hook up to the instrument cluster .
This problem could be very simple in nature but could be like looking for a needle in a hay stack if you know what i mean . There are also electronic modules inside the doors , driver door module , passanger door module etc... these control the windows an the locks ,power mirrors etc...
Your best bet , take your vehicle to a qualified repair shop.

Lot's of warning lights , check engine and all the others , You should have the vehicle checked for DTC'S - diagnostic trouble codes . Lost power codes probably ! Could be a number of thing's ,ignition switch , BCM - body control module just to name a couple . DTC'S will point in the right diagnostic direction . The electronic's on your vehicle Are complex to say the least .
The body control system consists of the body control module (BCM), communications, and various input and outputs. Some inputs, outputs and messages require other modules to interact with the BCM. The BCM also has discrete input and output terminals to control the vehicle body functions. The BCM is wired to the GMLAN High speed serial data buss and the GMLAN Low speed serial data buss and acts as a gateway between them. If the BCM does not communicate the vehicle will not start due to the inability of the engine/powertrain control module (ECM/PCM) and vehicle theft deterrent (VTD) control module to communicate without the BCM providing the gateway function.
Power Mode Master
This vehicles BCM functions as the power mode master (PMM). The ignition switch is a low current switch with multiple discrete ignition switch signals to the PMM for determination the power mode that will be sent over the serial data circuits to the other modules that need this information, and so the PMM will activate relays and other direct outputs of the PMM as needed. Refer to Power Mode Description and Operation for a complete description of power mode functions.
This is something you should have checked out by a qualified repair shop .